US20150372791A1 - Automatic frequency calibration method and small cell using the same - Google Patents
Automatic frequency calibration method and small cell using the same Download PDFInfo
- Publication number
- US20150372791A1 US20150372791A1 US14/596,252 US201514596252A US2015372791A1 US 20150372791 A1 US20150372791 A1 US 20150372791A1 US 201514596252 A US201514596252 A US 201514596252A US 2015372791 A1 US2015372791 A1 US 2015372791A1
- Authority
- US
- United States
- Prior art keywords
- base station
- type base
- small cell
- transmitted
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
-
- H04W72/005—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
- H03J2200/05—Alignment of transmitter with a receiver, after fabrication
Definitions
- the disclosure relates in general to a wireless communications, and more particularly to an automatic frequency calibration method and a small cell using the same.
- the operator may set up a plurality of small cells to build up a dense telecommunications network.
- small cells include femtocells, picocells, and microcells.
- the frequency of the small cell may offset due to long operation or the environmental temperature. Once the frequency offset of the small cell is too large, the small cell may not function normally.
- the disclosure is directed to an automatic frequency calibration method and a small cell using the same.
- the frequency of the small cell is calibrated according to the base station in the surrounding environment, such that the frequency of the small cell can be accurate.
- an automatic frequency calibration method of a small cell comprises the following steps.
- a set of at least one broadcasting message in a surrounding environment is received. Whether part of the at least one broadcasting message is transmitted from at least one first type base station is determined. A signal coverage of the first type base station is larger than a signal coverage of the small cell. If part of the at least one broadcasting message is transmitted from the first type base station, then a frequency of the small cell is calibrated according to one of the at least one first type base station whose signal strength is maximum. If all of the at least one broadcasting message are not transmitted from the first type base station, the frequency of the small cell is calibrated according to at least one second type base station. A signal coverage of the second type base station is smaller than the signal coverage of the first type base station.
- a small cell comprises a receiving unit and a processing unit.
- the receiving unit is used for receiving a set of at least one broadcasting message in a surrounding environment.
- the processing unit is used for determining whether part of the at least one broadcasting message is transmitted from at least one first type base station. A signal coverage of the first type base station is larger than a signal coverage of the small cell. If part of the at least one broadcasting message is transmitted from the first type base station, then the processing unit calibrates a frequency of the small cell according to one of the at least one first type base station whose signal strength is maximum.
- the processing unit calibrates the frequency of the small cell according to at least one second type base station.
- a signal coverage of the second type base station is smaller than the signal coverage of the first type base station.
- FIG. 1 shows a small cell and its surrounding environment according to an embodiment.
- FIG. 2 shows a flowchart of an automatic frequency calibration method of the small cell according to an embodiment.
- FIG. 3A shows exemplary details of the step S 120 in FIG. 2 in a case that the small cell is a 4G LTE small cell.
- FIG. 3B shows exemplary details of the step S 120 in FIG. 2 in a case that the small cell is a 3G WCDMA small cell.
- FIG. 3C shows exemplary details of the step S 120 in FIG. 2 in a case that the small cell is a 3G TD-SCDMA small cell.
- FIG. 4 shows the small cell and its surrounding environment according to another embodiment.
- FIG. 5A shows exemplary details of the step S 140 in FIG. 2 according to one embodiment.
- FIG. 5B illustrates a calibration process performed according to the steps in FIG. 5A .
- FIG. 6A shows exemplary details of the step S 140 in FIG. 2 according to another embodiment.
- FIG. 6B illustrates a calibration process performed according to the steps in FIG. 6A .
- FIG. 7A shows exemplary details of the step S 140 in FIG. 2 according to another embodiment.
- FIG. 7B illustrates a calibration process performed according to the steps in FIG. 7A .
- FIG. 1 shows a small cell 100 and its surrounding environment according to an embodiment.
- FIG. 2 shows a flowchart of an automatic frequency calibration method of the small cell 100 according to an embodiment.
- the small cell 100 includes a receiving unit 110 , a processing unit 120 and a transmitting unit 130 .
- the receiving unit 110 receives wireless signals.
- the processing unit 120 performs processing procedures, calculating procedures and determining procedures.
- the processing unit 120 may be an integrated circuit (IC).
- the transmitting unit 130 transmits wireless signals.
- the receiving unit 110 and the transmitting unit 130 may be a combination of an antenna module, an analog/digital converter and a radio frequency controlling chip.
- the receiving unit 110 and the transmitting unit 130 may be integrated into a single transceiver.
- the frequency of the small cell 100 of the present embodiment may be automatically calibrated by performing the following automatic frequency calibration method.
- the small cell 100 may perform the calibration method from time to time to prevent frequency offset from becoming too large.
- the receiving unit 110 of the small cell 100 receives a set of at least one broadcasting message in a surrounding environment.
- the broadcasting message may be transmitted from Macrocells 300 a , 300 b , whose signal coverage is 500 to 1000 meters, Picocells 200 a , 200 b , whose signal coverage is 100 to 500 meters or small cells 100 a , 100 b , whose signal coverage is 1 to 100 meters.
- a signal coverage of the first type base station is larger than a signal coverage of the small cell 100 .
- each of the Macrocells 300 a , 300 b and the Picocells 200 a , 200 b is the first type base station.
- a signal coverage of the second type base station is not larger than the signal coverage of the small cell 100 .
- each of the small cells 100 a , 100 b is the second type base station.
- step S 120 the processing unit 120 determines whether part of the at least one broadcasting message is transmitted from the first type base station. If part of the at least one broadcasting message is transmitted from the first type base station, then the process proceeds to step S 130 ; if all of the at least one broadcasting message are not transmitted from the first type base station, i.e. all of the at least one broadcasting message are transmitted from the second type base station, then the process proceeds to step S 140 .
- FIG. 3A shows exemplary details of the step S 120 in FIG. 2 in a case that the small cell 100 is a 4G LTE small cell.
- FIG. 3B shows exemplary details of the step S 120 in FIG. 2 in a case that the small cell 100 is a 3G WCDMA small cell.
- FIG. 3C shows exemplary details of the step S 120 in FIG. 2 in a case that the small cell 100 is a 3G TD-SCDMA small cell.
- step S 121 the processing unit 120 determines whether the broadcast message comprises a SIB 9; or whether a reference signal power of a SIB 2 of the broadcast message is greater than 0 dBm. If the result of the determination is “yes”, then the process proceeds to step S 122 ; otherwise, the process proceeds to step S 123 .
- step S 122 the processing unit 120 determines that this broadcast message is transmitted from the first type base station.
- step S 123 the processing unit 120 determines that this broadcast message is transmitted from the second type base station.
- step S 124 the processing unit 120 determines whether a P-CPICH power of a SIB 5 of the broadcast message is greater than 20 dBm. If the result of the determination is “yes”, then the process proceeds to step S 125 ; otherwise, the process proceeds to step S 126 .
- step S 125 the processing unit 120 determines that this broadcast message is transmitted from the first type base station.
- step S 126 the processing unit 120 determines that this broadcast message is transmitted from the second type base station.
- step S 127 the processing unit 120 determines whether a PCCPCH power of a SIB 5 of the broadcast message is greater than 20 dBm. If the result of the determination is “yes”, then the process proceeds to step S 128 ; otherwise, the process proceeds to step S 129 .
- step S 128 the processing unit 120 determines that this broadcast message is transmitted from the first type base station.
- step S 129 the processing unit 120 determines that this broadcast message is transmitted from the second type base station.
- each broadcast message can be determined as being transmitted from the first type base station or the second type base station.
- the broadcast messages received by the small cell 100 are transmitted from two Macrocells 300 a , 300 b , two Picocells 200 a , 200 b and two small cells 100 a , 100 b . Because some broadcast messages are transmitted from the first type base stations, the process proceeds to step S 130 .
- the processing unit 120 calibrates the frequency of the small cell 100 according to one of the first type base stations whose signal strength is maximum.
- FIG. 4 shows the small cell 100 and its surrounding environment according to another embodiment.
- the broadcast messages received by the small cell 100 are transmitted from seven small cells 100 c , 100 d , 100 e , 100 f , 100 g , 100 h and 100 i .
- the processing unit 120 calibrates the frequency of the small cell 100 according to the second type base station, such as the small cells 100 c , 100 d , 100 e , 100 f , 100 g , 100 h and 100 i.
- the automatic frequency calibration method of FIG. 2 can be performed from time to time, such that the frequency of the small cell 100 can be accurate all the time.
- the step S 140 can be performed by several ways.
- FIGS. 5A , 6 A and 7 A show exemplary details of the step S 140 in FIG. 2 according to three different embodiments.
- FIG. 5B illustrates a calibration process performed according to the steps in FIG. 5A .
- the processing unit 120 selects at least two reference base stations A 1 , A 2 , A 3 , A 4 , A 5 and A 6 from the second type base stations, such as small cells 100 c , 100 d , 100 e , 100 f , 100 g , 100 h and 100 i , and records those reference base stations A 1 to A 6 in a reference list.
- some of the second type base stations which have been calibrated according to any first type base station can be selected to be the reference base stations.
- all of the second type base stations are not calibrated according to any first base station, all of the second type base stations can be selected to be the reference base stations. As such, some of the second type base stations whose frequencies are accurate can be selected to be the reference base stations first.
- step S 1412 the processing unit 120 divides the reference base stations A 1 to A 6 into at least two reference groups G 11 , G 12 and G 13 .
- Frequency offset ranges of all of the reference groups G 11 , G 12 and G 13 do not overlap with each other.
- the frequency offset of each reference base station A 1 , A 2 , A 3 , A 4 , A 5 or A 6 is the difference between the frequency of each reference base station A 1 , A 2 , A 3 , A 4 , A 5 or A 6 and the frequency of the small cell 100 .
- the size of the frequency offset range of each reference group G 11 , G 12 or G 13 can be N times of a tolerate value.
- N is 0.1 to 2.
- the tolerate value is ⁇ 100 Hz and N is 0.5, then the size of the frequency offset range of each reference group G 11 , G 12 or G 13 can be set as 100 Hz.
- the processing unit 120 selects a target group whose number of the second type base stations is maximum, such as the reference group G 12 which is surrounded by dashed lines, from the reference groups G 11 to G 13 .
- the processing unit 120 calculates an average frequency offset E 12 of the target group, such as the reference group G 12 .
- the processing unit 120 calibrates the frequency of the small cell 100 according to a target base station whose frequency offset is closest to the average frequency offset E 12 , such as the reference base station A 3 , or according to the average frequency offset E 12 of the target group, such as the reference group G 12 .
- FIG. 6B illustrates a calibration process performed according to the steps in FIG. 6A .
- the processing unit 120 selects at least two reference base stations A 1 to A 6 from the second type base stations, such as the small cells 100 c to 100 i , and records those reference base stations A 1 to A 6 in a reference list.
- Step S 1421 is similar to the step S 1411 , and the details are not repeated here.
- step S 1422 the processing unit 120 divides the reference base stations A 1 to A 6 into a first reference group G 21 and a second reference group G 22 .
- a maximum frequency offset F 2 of the first reference group G 21 is smaller than an average frequency offset E 0 of all of the reference base stations A 1 to A 6 .
- a minimum frequency offset F 3 of the second reference group G 22 is greater than or equal to the average frequency offset E 0 of the reference base stations A 1 to A 6 .
- step S 1423 the processing unit 120 determines whether a difference between a number of the reference base stations in the first reference group G 21 and a number of the reference base stations in the second reference group G 22 is greater than or equal to a predetermined value, such as 2. If the difference is greater than or equal to the predetermined value, then the process proceeds to S 1424 ; otherwise, the process proceeds to S 1425 .
- a predetermined value such as 2.
- step S 1424 the processing unit 120 removes one of the first reference group G 21 and the second reference group G 22 in which the number of the reference base stations is smallest from the reference list. For example, the first reference group G 21 is removed from the reference list, and the process back to the step S 1422 .
- the processing unit 120 divides the reference base stations A 3 to A 6 into another first reference group G 221 and another second group G 222 . Afterwards, during the process of performing the step S 1423 second times, the processing unit 120 determines whether a difference between a number of the reference base stations in the first reference group G 221 and a number of the reference base stations in the second reference group G 222 is greater than or equal to a predetermined value, such as 2. If the difference is smaller than the predetermined value, then the process proceeds to step S 1425 . As shown in FIG. 6B , the difference is 0, then the process proceeds to step S 1425 .
- a predetermined value such as 2.
- step S 1425 the process unit 120 calibrates the frequency of the small cell 100 according to an average frequency offset E 22 of the reference group G 22 which is surrounded by a dashed lines.
- FIG. 7B illustrates a calibration process performed according to the steps in FIG. 7A .
- the processing unit 120 selects at least one reference base station A 1 to A 6 from the at least one second type base station, such as the small cells 100 c to 100 i , and records the at least one reference base station A 1 to A 6 in a reference list.
- step S 1432 the processing unit 120 calculates an average frequency offset E 0 of those reference base stations A 1 to A 6 which are surrounded with a dashed line.
- step S 1433 the processing unit 120 calibrates the frequency of the small cell 100 according to the average offset E 0 .
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
An automatic frequency calibration method and a small cell using the same are provided. The automatic frequency calibration method comprises the following steps. A set of at least one broadcasting message in a surrounding environment is received. Whether part of the at least one broadcasting message is transmitted from at least one first type base station is determined. If part of the at least one broadcasting message is transmitted from the first type base station, then a frequency of the small cell is calibrated according to one of the at least one first type base station whose signal strength is maximum. If all of the at least one broadcasting message are not transmitted from the first type base station, the frequency of the small cell is calibrated according to at least one second type base station.
Description
- This application claims the benefit of People's Republic of China application Serial No. 201410284594.3, filed Jun. 23, 2014, the disclosure of which is incorporated by reference herein in its entirety.
- 1. Technical Field
- The disclosure relates in general to a wireless communications, and more particularly to an automatic frequency calibration method and a small cell using the same.
- 2. Description of the Related Art
- For improving the telecommunication service and the quality thereof, the operator may set up a plurality of small cells to build up a dense telecommunications network. Examples of small cells include femtocells, picocells, and microcells.
- However, the frequency of the small cell may offset due to long operation or the environmental temperature. Once the frequency offset of the small cell is too large, the small cell may not function normally.
- The disclosure is directed to an automatic frequency calibration method and a small cell using the same. The frequency of the small cell is calibrated according to the base station in the surrounding environment, such that the frequency of the small cell can be accurate.
- According to one aspect of the invention, an automatic frequency calibration method of a small cell is provided. The automatic frequency calibration method comprises the following steps. A set of at least one broadcasting message in a surrounding environment is received. Whether part of the at least one broadcasting message is transmitted from at least one first type base station is determined. A signal coverage of the first type base station is larger than a signal coverage of the small cell. If part of the at least one broadcasting message is transmitted from the first type base station, then a frequency of the small cell is calibrated according to one of the at least one first type base station whose signal strength is maximum. If all of the at least one broadcasting message are not transmitted from the first type base station, the frequency of the small cell is calibrated according to at least one second type base station. A signal coverage of the second type base station is smaller than the signal coverage of the first type base station.
- According to another aspect of the invention, a small cell is provided. The small cell comprises a receiving unit and a processing unit. The receiving unit is used for receiving a set of at least one broadcasting message in a surrounding environment. The processing unit is used for determining whether part of the at least one broadcasting message is transmitted from at least one first type base station. A signal coverage of the first type base station is larger than a signal coverage of the small cell. If part of the at least one broadcasting message is transmitted from the first type base station, then the processing unit calibrates a frequency of the small cell according to one of the at least one first type base station whose signal strength is maximum. If all of the at least one broadcasting message are not transmitted from the first type base station, then the processing unit calibrates the frequency of the small cell according to at least one second type base station. A signal coverage of the second type base station is smaller than the signal coverage of the first type base station.
-
FIG. 1 shows a small cell and its surrounding environment according to an embodiment. -
FIG. 2 shows a flowchart of an automatic frequency calibration method of the small cell according to an embodiment. -
FIG. 3A shows exemplary details of the step S120 inFIG. 2 in a case that the small cell is a 4G LTE small cell. -
FIG. 3B shows exemplary details of the step S120 inFIG. 2 in a case that the small cell is a 3G WCDMA small cell. -
FIG. 3C shows exemplary details of the step S120 inFIG. 2 in a case that the small cell is a 3G TD-SCDMA small cell. -
FIG. 4 shows the small cell and its surrounding environment according to another embodiment. -
FIG. 5A shows exemplary details of the step S140 inFIG. 2 according to one embodiment. -
FIG. 5B illustrates a calibration process performed according to the steps inFIG. 5A . -
FIG. 6A shows exemplary details of the step S140 inFIG. 2 according to another embodiment. -
FIG. 6B illustrates a calibration process performed according to the steps inFIG. 6A . -
FIG. 7A shows exemplary details of the step S140 inFIG. 2 according to another embodiment. -
FIG. 7B illustrates a calibration process performed according to the steps inFIG. 7A . - In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
- Please refer to
FIGS. 1 and 2 .FIG. 1 shows asmall cell 100 and its surrounding environment according to an embodiment.FIG. 2 shows a flowchart of an automatic frequency calibration method of thesmall cell 100 according to an embodiment. Thesmall cell 100 includes areceiving unit 110, aprocessing unit 120 and a transmittingunit 130. Thereceiving unit 110 receives wireless signals. Theprocessing unit 120 performs processing procedures, calculating procedures and determining procedures. Theprocessing unit 120 may be an integrated circuit (IC). The transmittingunit 130 transmits wireless signals. The receivingunit 110 and the transmittingunit 130 may be a combination of an antenna module, an analog/digital converter and a radio frequency controlling chip. The receivingunit 110 and the transmittingunit 130 may be integrated into a single transceiver. - The frequency of the
small cell 100 of the present embodiment may be automatically calibrated by performing the following automatic frequency calibration method. Thesmall cell 100 may perform the calibration method from time to time to prevent frequency offset from becoming too large. - In step S110, the receiving
unit 110 of thesmall cell 100 receives a set of at least one broadcasting message in a surrounding environment. The broadcasting message may be transmitted fromMacrocells Picocells small cells small cell 100. For example, each of theMacrocells Picocells small cell 100. For example, each of thesmall cells - In step S120, the
processing unit 120 determines whether part of the at least one broadcasting message is transmitted from the first type base station. If part of the at least one broadcasting message is transmitted from the first type base station, then the process proceeds to step S130; if all of the at least one broadcasting message are not transmitted from the first type base station, i.e. all of the at least one broadcasting message are transmitted from the second type base station, then the process proceeds to step S140. - According to the specification of the
small cell 100, there are different embodiments to perform the step S120. Please refer toFIGS. 3A to 3C .FIG. 3A shows exemplary details of the step S120 inFIG. 2 in a case that thesmall cell 100 is a 4G LTE small cell.FIG. 3B shows exemplary details of the step S120 inFIG. 2 in a case that thesmall cell 100 is a 3G WCDMA small cell.FIG. 3C shows exemplary details of the step S120 in FIG. 2 in a case that thesmall cell 100 is a 3G TD-SCDMA small cell. - As shown in
FIG. 3A , in the case that thesmall cell 100 is a 4G LTE small cell, whether the broadcast message is transmitted from the first type base station or the second base station can be determined by performing the steps inFIG. 3A . In step S121, theprocessing unit 120 determines whether the broadcast message comprises a SIB 9; or whether a reference signal power of a SIB 2 of the broadcast message is greater than 0 dBm. If the result of the determination is “yes”, then the process proceeds to step S122; otherwise, the process proceeds to step S123. In step S122, theprocessing unit 120 determines that this broadcast message is transmitted from the first type base station. In step S123, theprocessing unit 120 determines that this broadcast message is transmitted from the second type base station. - As shown in
FIG. 3B , in the case that thesmall cell 100 is a 3G WCDMA small cell, whether the broadcast message is transmitted from the first type base station or the second base station can be determined by performing the steps inFIG. 3B . In step S124, theprocessing unit 120 determines whether a P-CPICH power of a SIB 5 of the broadcast message is greater than 20 dBm. If the result of the determination is “yes”, then the process proceeds to step S125; otherwise, the process proceeds to step S126. In step S125, theprocessing unit 120 determines that this broadcast message is transmitted from the first type base station. In step S126, theprocessing unit 120 determines that this broadcast message is transmitted from the second type base station. - As shown in
FIG. 3C , in the case that thesmall cell 100 is a 3G TD-SCDMA small cell, whether the broadcast message is transmitted from the first type base station or the second base station can be determined by performing the steps inFIG. 3C . In step S127, theprocessing unit 120 determines whether a PCCPCH power of a SIB 5 of the broadcast message is greater than 20 dBm. If the result of the determination is “yes”, then the process proceeds to step S128; otherwise, the process proceeds to step S129. In step S128, theprocessing unit 120 determines that this broadcast message is transmitted from the first type base station. In step S129, theprocessing unit 120 determines that this broadcast message is transmitted from the second type base station. - After performing the step S120 in
FIG. 2 , each broadcast message can be determined as being transmitted from the first type base station or the second type base station. - As shown in
FIG. 1 , the broadcast messages received by thesmall cell 100 are transmitted from two Macrocells 300 a, 300 b, twoPicocells small cells processing unit 120 calibrates the frequency of thesmall cell 100 according to one of the first type base stations whose signal strength is maximum. - Please refer to
FIG. 4 .FIG. 4 shows thesmall cell 100 and its surrounding environment according to another embodiment. The broadcast messages received by thesmall cell 100 are transmitted from sevensmall cells processing unit 120 calibrates the frequency of thesmall cell 100 according to the second type base station, such as thesmall cells - The automatic frequency calibration method of
FIG. 2 can be performed from time to time, such that the frequency of thesmall cell 100 can be accurate all the time. - According to other design requirement, the step S140 can be performed by several ways. For example, please refer to
FIGS. 5A , 6A and 7A.FIGS. 5A , 6A and 7A show exemplary details of the step S140 inFIG. 2 according to three different embodiments. -
FIG. 5B illustrates a calibration process performed according to the steps inFIG. 5A . In step S1411, theprocessing unit 120 selects at least two reference base stations A1, A2, A3, A4, A5 and A6 from the second type base stations, such assmall cells - In step S1412, the
processing unit 120 divides the reference base stations A1 to A6 into at least two reference groups G11, G12 and G13. Frequency offset ranges of all of the reference groups G11, G12 and G13 do not overlap with each other. The frequency offset of each reference base station A1, A2, A3, A4, A5 or A6 is the difference between the frequency of each reference base station A1, A2, A3, A4, A5 or A6 and the frequency of thesmall cell 100. - In one embodiment, the size of the frequency offset range of each reference group G11, G12 or G13 can be N times of a tolerate value. N is 0.1 to 2. For example, if the tolerate value is ±100 Hz and N is 0.5, then the size of the frequency offset range of each reference group G11, G12 or G13 can be set as 100 Hz.
- In S1413, the
processing unit 120 selects a target group whose number of the second type base stations is maximum, such as the reference group G12 which is surrounded by dashed lines, from the reference groups G11 to G13. In step S1414, theprocessing unit 120 calculates an average frequency offset E12 of the target group, such as the reference group G12. In step S1415, theprocessing unit 120 calibrates the frequency of thesmall cell 100 according to a target base station whose frequency offset is closest to the average frequency offset E12, such as the reference base station A3, or according to the average frequency offset E12 of the target group, such as the reference group G12. -
FIG. 6B illustrates a calibration process performed according to the steps inFIG. 6A . In step S1421, theprocessing unit 120 selects at least two reference base stations A1 to A6 from the second type base stations, such as thesmall cells 100 c to 100 i, and records those reference base stations A1 to A6 in a reference list. Step S1421 is similar to the step S1411, and the details are not repeated here. - In step S1422, the
processing unit 120 divides the reference base stations A1 to A6 into a first reference group G21 and a second reference group G22. A maximum frequency offset F2 of the first reference group G21 is smaller than an average frequency offset E0 of all of the reference base stations A1 to A6. A minimum frequency offset F3 of the second reference group G22 is greater than or equal to the average frequency offset E0 of the reference base stations A1 to A6. - In step S1423, the
processing unit 120 determines whether a difference between a number of the reference base stations in the first reference group G21 and a number of the reference base stations in the second reference group G22 is greater than or equal to a predetermined value, such as 2. If the difference is greater than or equal to the predetermined value, then the process proceeds to S1424; otherwise, the process proceeds to S1425. - In step S1424, the
processing unit 120 removes one of the first reference group G21 and the second reference group G22 in which the number of the reference base stations is smallest from the reference list. For example, the first reference group G21 is removed from the reference list, and the process back to the step S1422. - During the process of performing the step S1422 second times, the
processing unit 120 divides the reference base stations A3 to A6 into another first reference group G221 and another second group G222. Afterwards, during the process of performing the step S1423 second times, theprocessing unit 120 determines whether a difference between a number of the reference base stations in the first reference group G221 and a number of the reference base stations in the second reference group G222 is greater than or equal to a predetermined value, such as 2. If the difference is smaller than the predetermined value, then the process proceeds to step S1425. As shown inFIG. 6B , the difference is 0, then the process proceeds to step S1425. - In step S1425, the
process unit 120 calibrates the frequency of thesmall cell 100 according to an average frequency offset E22 of the reference group G22 which is surrounded by a dashed lines. -
FIG. 7B illustrates a calibration process performed according to the steps inFIG. 7A . In step S1431, theprocessing unit 120 selects at least one reference base station A1 to A6 from the at least one second type base station, such as thesmall cells 100 c to 100 i, and records the at least one reference base station A1 to A6 in a reference list. - In step S1432, the
processing unit 120 calculates an average frequency offset E0 of those reference base stations A1 to A6 which are surrounded with a dashed line. - In step S1433, the
processing unit 120 calibrates the frequency of thesmall cell 100 according to the average offset E0. - It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.
Claims (13)
1. An automatic frequency calibration method of a small cell, wherein the automatic frequency calibration method comprises:
receiving a set of at least one broadcasting message in a surrounding environment;
determining whether part of the at least one broadcasting message is transmitted from at least one first type base station, wherein a signal coverage of the first type base station is larger than a signal coverage of the small cell;
calibrating a frequency of the small cell according to one of the at least one first type base station whose signal strength is maximum, if part of the at least one broadcasting message is transmitted from the first type base station; and
calibrating the frequency of the small cell according to at least one second type base station, if all of the at least one broadcasting message are not transmitted from the first type base station, wherein a signal coverage of the second type base station is smaller than the signal coverage of the first type base station.
2. The automatic frequency calibration method according to claim 1 , wherein the first type base station is a Macrocell or a Picocell, and the second type base station is a small cell.
3. The automatic frequency calibration method according to claim 1 , wherein in the step of determining whether part of the at least one broadcasting message is transmitted from the first type base station, one of the at least one broadcasting message which comprises a SIB 9 is determined as being transmitted from the first type base station.
4. The automatic frequency calibration method according to claim 1 , wherein in the step of determining whether part of the at least one broadcasting message is transmitted from the first type base station, one of the at least one broadcasting message whose reference signal power of a SIB 2 is greater than 0 dBm is determined as being transmitted from the first type base station.
5. The automatic frequency calibration method according to claim 1 , wherein in the step of determining whether part of the at least one broadcasting message is transmitted from the first type base station, one of the at least one broadcasting message whose P-CPICH power of a SIB 5 is greater than 20 dBm is determined as being transmitted from the first type base station.
6. The automatic frequency calibration method according to claim 1 , wherein in the step of determining whether part of the at least one broadcasting message is transmitted from the first type base station, one of the at least one broadcasting message whose PCCPCH power of a SIB 5 is greater than 20 dBm is determined as being transmitted from the first type base station.
7. The automatic frequency calibration method according to claim 1 , wherein the step of calibrating the frequency of the small cell according to the second type base station comprises:
selecting at least two reference base stations form the at least one second type base station, and recording the reference base stations in a reference list;
dividing the reference base stations into at least two reference groups, wherein frequency offset ranges of all of the reference groups do not overlap with each other;
selecting a target group whose number of the second type base stations is maximum from the reference groups;
calculating an average frequency offset of the target group; and
calibrating the frequency of the small cell according to a target base station whose frequency offset is closest to the average frequency offset or according to the average frequency offset of the target group.
8. The automatic frequency calibration method according to claim 7 , wherein the frequency offset ranges of the reference groups have the same size.
9. The automatic frequency calibration method according to claim 7 , wherein the size of the frequency offset range of each reference group is N times of a tolerate value, and N is between 0.1 and 2.
10. The automatic frequency calibration method according to claim 1 , wherein the step of calibrating the frequency of the small cell according to the second type base station comprises:
selecting at least two reference base stations from the at least one second type base station, and recording the reference base stations in a reference list;
dividing the reference base stations into a first reference group and a second group, wherein a maximum frequency offset of the first reference group is smaller than an average frequency offset of the reference base stations, and a minimum frequency offset of the second reference group is greater than or equal to the average frequency offset of the reference base stations;
determining whether a difference between a number of the reference base stations in the first reference group and a number of the reference base stations in the second reference group is greater than or equal to a predetermined value;
removing one of the first reference group and the second reference group in which the number of the reference base stations is smallest from the reference list, if the difference is larger than or equal to the predetermined value; and
calibrating the frequency of the small cell according to the average frequency offset, if the difference is smaller than the predetermined value.
11. The automatic frequency calibration method according to claim 1 , wherein the step of calibrating the frequency of the small cell according to the second type base station comprises:
selecting at least one reference base station from the at least one second type base station, and recording the at least one reference base station in a reference list;
calculating an average frequency offset of the at least one reference base station; and
calibrating the frequency of the small cell according to the average offset.
12. A small cell, comprising:
a receiving unit, used for receiving a set of at least one broadcasting message in a surrounding environment; and
a processing unit, used for determining whether part of the at least one broadcasting message is transmitted from at least one first type base station, wherein a signal coverage of the first type base station is larger than a signal coverage of the small cell;
wherein,
if part of the at least one broadcasting message is transmitted from the first type base station, then the processing unit calibrates a frequency of the small cell according to one of the at least one first type base station whose signal strength is maximum;
if all of the at least one broadcasting message are not transmitted from the first type base station, then the processing unit calibrates the frequency of the small cell according to at least one second type base station, and a signal coverage of the second type base station is smaller than the signal coverage of the first type base station.
13. The small cell according to claim 12 , wherein the first type base station is a Macrocell or a Picocell, and the second type base station is a small cell.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410284594.3A CN104023387B (en) | 2014-06-23 | 2014-06-23 | Femto cell and its automatic calibration frequency method |
CN201410284594 | 2014-06-23 | ||
CN201410284594.3 | 2014-06-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150372791A1 true US20150372791A1 (en) | 2015-12-24 |
US9692565B2 US9692565B2 (en) | 2017-06-27 |
Family
ID=51439901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/596,252 Active 2035-04-01 US9692565B2 (en) | 2014-06-23 | 2015-01-14 | Automatic frequency calibration method and small cell using the same |
Country Status (2)
Country | Link |
---|---|
US (1) | US9692565B2 (en) |
CN (1) | CN104023387B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180167973A1 (en) * | 2016-12-08 | 2018-06-14 | Electronics And Telecommunications Research Institute | Method for controlling wireless communication network and server therefor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106851818B (en) * | 2017-03-30 | 2020-05-19 | 博威通讯系统(深圳)有限公司 | Method for calibrating frequency offset of micro base station |
Citations (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6563893B2 (en) * | 2001-05-17 | 2003-05-13 | Ut-Battelle, Llc | Carrier-frequency synchronization system for improved amplitude modulation and television broadcast reception |
US20040005897A1 (en) * | 2001-06-21 | 2004-01-08 | Naohito Tomoe | Wireless communication base station system, wireless communication method, wireless communication program, and computer-readable recorded medium on which wireless communication program is recorded |
US6792275B1 (en) * | 1998-12-23 | 2004-09-14 | Telecommunication Laboratories, Changhwa Telecom Co., Ltd. | Fuzzy channel allocation controller having service quality insuring |
US20050130662A1 (en) * | 2003-12-12 | 2005-06-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobile communications in a hierarchical cell structure |
US20070097938A1 (en) * | 2005-10-04 | 2007-05-03 | Telefonaktiebolaget Lm Ericsson | Automatic building of neighbor lists in mobile system |
US20080310563A1 (en) * | 2007-06-15 | 2008-12-18 | Jie Zhu | Broadcast channel estimator |
US20090042596A1 (en) * | 2007-08-10 | 2009-02-12 | Qualcomm Incorporated | Adaptation of transmit power based on channel quality |
US20100008323A1 (en) * | 2008-07-11 | 2010-01-14 | Qualcomm Incorporated | Method and apparatus for femto cell deployment using neighbor list messages and its use in femto cell system selection |
US20100029274A1 (en) * | 2008-08-04 | 2010-02-04 | Qualcomm Incorporated | System and method for cell search and selection in a wireless communication system |
US20100087203A1 (en) * | 2008-10-06 | 2010-04-08 | Samsung Electronics Co., Ltd. | Method and apparatus for interference control in a wireless communication system with hierarchical cell layout |
US20100099431A1 (en) * | 2008-10-22 | 2010-04-22 | Qualcomm Incorporated | Method and system for interference management in a spectrum shared by wan and femto cells |
US20100098195A1 (en) * | 2008-10-20 | 2010-04-22 | Michael Nekhamkin | Systems and methods for frequency offset correction in a digital radio broadcast receiver |
US20100120438A1 (en) * | 2008-11-12 | 2010-05-13 | Industrial Technology Research Institute | Communication network method and apparatus including macro base station and femto base station |
US20100136996A1 (en) * | 2008-11-28 | 2010-06-03 | Samsung Electronics Co., Ltd. | Apparatus and method for selecting frequency allocation of femto base station |
US20100216486A1 (en) * | 2009-02-24 | 2010-08-26 | Samsung Electronics Co., Ltd. | Communication system and method for controlling interference caused by different kinds of base stations |
US20110003559A1 (en) * | 2008-03-31 | 2011-01-06 | Motoki Morita | Radio station apparatus, radio resource control method, recording medium storing radio station control program, and radio communication system |
US20110151886A1 (en) * | 2009-12-21 | 2011-06-23 | Cisco Technology, Inc. | System and method for providing resource management in a network environment |
US20110190003A1 (en) * | 2008-07-25 | 2011-08-04 | Telefonaktiebolaget L M Ericsson (Publ) | Systems and methods for reducing interference between a macro base station and a femto base station |
US20110281574A1 (en) * | 2009-11-17 | 2011-11-17 | Qualcomm Incorporated | Access terminal-assisted time and/or frequency tracking |
US20110299488A1 (en) * | 2008-12-08 | 2011-12-08 | Young Yong Kim | Method of radio resource allocation and method of neighbor information transmission in wireless communication system |
US20110300807A1 (en) * | 2010-06-07 | 2011-12-08 | Samsung Electronics Co. Ltd. | Apparatus and method for controlling interference in wireless communication system of hierarchical cell structure |
US20120115498A1 (en) * | 2010-11-08 | 2012-05-10 | Sungkyunkwan University Foundation For Corporate Collaboration | Apparatus and method for cluster based opportunistic power control in wireless communication system |
US20120184311A1 (en) * | 2009-10-07 | 2012-07-19 | Sumitomo Electric Industries, Ltd. | Base station device |
US20130189977A1 (en) * | 2009-03-30 | 2013-07-25 | At&T Mobility Ii Llc | Indoor competitive survey of wireless networks |
US20140112250A1 (en) * | 2011-04-05 | 2014-04-24 | Black Berry Limited | Method of interference cancellation and method of detection of erroneous neighbour cell measurements |
US20150071100A1 (en) * | 2012-05-02 | 2015-03-12 | Lg Electric Inc. | Method for estimating abs zone in wireless access system and apparatus for same |
US20150208314A1 (en) * | 2012-08-29 | 2015-07-23 | Telefonica, S.A. | Method for reducing signaling messages and handovers in wireless networks |
US20150223149A1 (en) * | 2014-01-31 | 2015-08-06 | Futurewei Technologies, Inc. | Device, Network, and Method for Network Adaptation and Utilizing a Downlink Discovery Reference Signal |
US20150334612A1 (en) * | 2014-05-13 | 2015-11-19 | Qualcomm Incorporated | Small cell channel selection |
US20150373712A1 (en) * | 2014-06-18 | 2015-12-24 | Electronics And Telecommunications Research Institute | Method and apparatus for allocating resource in heterogeneous network |
US9320045B2 (en) * | 2012-02-20 | 2016-04-19 | Sony Corporation | Communication control device, communication control method, and communication control program |
US20160249224A1 (en) * | 2015-02-24 | 2016-08-25 | Verizon Patent And Licensing Inc. | Coexistence of lte-u with wifi and/or another lte-u system in unlicensed spectrum |
US20160249390A1 (en) * | 2013-12-10 | 2016-08-25 | Intel IP Corporation | Mobile device paging and small cell connection establishment in heterogeneous networks |
US20160295490A1 (en) * | 2013-11-28 | 2016-10-06 | Nec Corporation | Wireless Communication Terminal, Storage Medium, and Cell Selection Method |
US20160360538A1 (en) * | 2015-06-04 | 2016-12-08 | Electronics And Telecommunications Research Institute | Small cell system and method for allocating resource thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100054237A1 (en) * | 2008-09-04 | 2010-03-04 | Motorola, Inc. | Synchronization for femto-cell base stations |
CN101742736B (en) * | 2008-11-07 | 2013-01-16 | 中兴通讯股份有限公司 | Method for correcting frequency offset of crystal oscillator of GSM (global system for mobile communications) base station |
WO2010114442A1 (en) * | 2009-04-01 | 2010-10-07 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for base station synchronisation |
-
2014
- 2014-06-23 CN CN201410284594.3A patent/CN104023387B/en active Active
-
2015
- 2015-01-14 US US14/596,252 patent/US9692565B2/en active Active
Patent Citations (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6792275B1 (en) * | 1998-12-23 | 2004-09-14 | Telecommunication Laboratories, Changhwa Telecom Co., Ltd. | Fuzzy channel allocation controller having service quality insuring |
US6563893B2 (en) * | 2001-05-17 | 2003-05-13 | Ut-Battelle, Llc | Carrier-frequency synchronization system for improved amplitude modulation and television broadcast reception |
US20040005897A1 (en) * | 2001-06-21 | 2004-01-08 | Naohito Tomoe | Wireless communication base station system, wireless communication method, wireless communication program, and computer-readable recorded medium on which wireless communication program is recorded |
US20050130662A1 (en) * | 2003-12-12 | 2005-06-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobile communications in a hierarchical cell structure |
US7142861B2 (en) * | 2003-12-12 | 2006-11-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobile communications in a hierarchical cell structure |
US20070097938A1 (en) * | 2005-10-04 | 2007-05-03 | Telefonaktiebolaget Lm Ericsson | Automatic building of neighbor lists in mobile system |
US20080310563A1 (en) * | 2007-06-15 | 2008-12-18 | Jie Zhu | Broadcast channel estimator |
US8175203B2 (en) * | 2007-06-15 | 2012-05-08 | Intel Corporation | Broadcast channel estimator |
US20090042596A1 (en) * | 2007-08-10 | 2009-02-12 | Qualcomm Incorporated | Adaptation of transmit power based on channel quality |
US20110003559A1 (en) * | 2008-03-31 | 2011-01-06 | Motoki Morita | Radio station apparatus, radio resource control method, recording medium storing radio station control program, and radio communication system |
US20100008323A1 (en) * | 2008-07-11 | 2010-01-14 | Qualcomm Incorporated | Method and apparatus for femto cell deployment using neighbor list messages and its use in femto cell system selection |
US20110190003A1 (en) * | 2008-07-25 | 2011-08-04 | Telefonaktiebolaget L M Ericsson (Publ) | Systems and methods for reducing interference between a macro base station and a femto base station |
US20100029274A1 (en) * | 2008-08-04 | 2010-02-04 | Qualcomm Incorporated | System and method for cell search and selection in a wireless communication system |
US20100087203A1 (en) * | 2008-10-06 | 2010-04-08 | Samsung Electronics Co., Ltd. | Method and apparatus for interference control in a wireless communication system with hierarchical cell layout |
US8068563B2 (en) * | 2008-10-20 | 2011-11-29 | Ibiquity Digital Corporation | Systems and methods for frequency offset correction in a digital radio broadcast receiver |
US20100098195A1 (en) * | 2008-10-20 | 2010-04-22 | Michael Nekhamkin | Systems and methods for frequency offset correction in a digital radio broadcast receiver |
US20100099431A1 (en) * | 2008-10-22 | 2010-04-22 | Qualcomm Incorporated | Method and system for interference management in a spectrum shared by wan and femto cells |
US20100120438A1 (en) * | 2008-11-12 | 2010-05-13 | Industrial Technology Research Institute | Communication network method and apparatus including macro base station and femto base station |
US20100136996A1 (en) * | 2008-11-28 | 2010-06-03 | Samsung Electronics Co., Ltd. | Apparatus and method for selecting frequency allocation of femto base station |
US20110299488A1 (en) * | 2008-12-08 | 2011-12-08 | Young Yong Kim | Method of radio resource allocation and method of neighbor information transmission in wireless communication system |
US20100216486A1 (en) * | 2009-02-24 | 2010-08-26 | Samsung Electronics Co., Ltd. | Communication system and method for controlling interference caused by different kinds of base stations |
US8761051B2 (en) * | 2009-03-30 | 2014-06-24 | At&T Mobility Ii Llc | Indoor competitive survey of wireless networks |
US20130189977A1 (en) * | 2009-03-30 | 2013-07-25 | At&T Mobility Ii Llc | Indoor competitive survey of wireless networks |
US20120184311A1 (en) * | 2009-10-07 | 2012-07-19 | Sumitomo Electric Industries, Ltd. | Base station device |
US20110281574A1 (en) * | 2009-11-17 | 2011-11-17 | Qualcomm Incorporated | Access terminal-assisted time and/or frequency tracking |
US20110151886A1 (en) * | 2009-12-21 | 2011-06-23 | Cisco Technology, Inc. | System and method for providing resource management in a network environment |
US20110300807A1 (en) * | 2010-06-07 | 2011-12-08 | Samsung Electronics Co. Ltd. | Apparatus and method for controlling interference in wireless communication system of hierarchical cell structure |
US20120115498A1 (en) * | 2010-11-08 | 2012-05-10 | Sungkyunkwan University Foundation For Corporate Collaboration | Apparatus and method for cluster based opportunistic power control in wireless communication system |
US20140112250A1 (en) * | 2011-04-05 | 2014-04-24 | Black Berry Limited | Method of interference cancellation and method of detection of erroneous neighbour cell measurements |
US9320045B2 (en) * | 2012-02-20 | 2016-04-19 | Sony Corporation | Communication control device, communication control method, and communication control program |
US20150071100A1 (en) * | 2012-05-02 | 2015-03-12 | Lg Electric Inc. | Method for estimating abs zone in wireless access system and apparatus for same |
US9467875B2 (en) * | 2012-05-02 | 2016-10-11 | Lg Electronics Inc. | Method for estimating ABS zone in wireless access system and apparatus for same |
US20150208314A1 (en) * | 2012-08-29 | 2015-07-23 | Telefonica, S.A. | Method for reducing signaling messages and handovers in wireless networks |
US20160295490A1 (en) * | 2013-11-28 | 2016-10-06 | Nec Corporation | Wireless Communication Terminal, Storage Medium, and Cell Selection Method |
US20160249390A1 (en) * | 2013-12-10 | 2016-08-25 | Intel IP Corporation | Mobile device paging and small cell connection establishment in heterogeneous networks |
US20150223149A1 (en) * | 2014-01-31 | 2015-08-06 | Futurewei Technologies, Inc. | Device, Network, and Method for Network Adaptation and Utilizing a Downlink Discovery Reference Signal |
US20150334612A1 (en) * | 2014-05-13 | 2015-11-19 | Qualcomm Incorporated | Small cell channel selection |
US20150373712A1 (en) * | 2014-06-18 | 2015-12-24 | Electronics And Telecommunications Research Institute | Method and apparatus for allocating resource in heterogeneous network |
US20160249224A1 (en) * | 2015-02-24 | 2016-08-25 | Verizon Patent And Licensing Inc. | Coexistence of lte-u with wifi and/or another lte-u system in unlicensed spectrum |
US20160360538A1 (en) * | 2015-06-04 | 2016-12-08 | Electronics And Telecommunications Research Institute | Small cell system and method for allocating resource thereof |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180167973A1 (en) * | 2016-12-08 | 2018-06-14 | Electronics And Telecommunications Research Institute | Method for controlling wireless communication network and server therefor |
US10716141B2 (en) * | 2016-12-08 | 2020-07-14 | Electronics And Telecommunications Research Institute | Method for controlling wireless communication network and server therefor |
Also Published As
Publication number | Publication date |
---|---|
CN104023387B (en) | 2018-01-30 |
CN104023387A (en) | 2014-09-03 |
US9692565B2 (en) | 2017-06-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3614737B1 (en) | Measurement method, measurement configuration method, and related device | |
US11382135B2 (en) | Configuring different types of random resources | |
JP6491220B2 (en) | Carrier Sense Adaptive Transmission (CSAT) measurement in shared spectrum | |
WO2018143118A1 (en) | Communication system with beam quality measurement | |
KR101394606B1 (en) | Operation and maintenance system for supporting scalable bandwidth, and femtocell ap thereof | |
WO2017206169A1 (en) | Methods and appratus to support mobility through beam tracking in new radio access system | |
US9608894B2 (en) | Method for testing radio frequency (RF) data packet signal transceivers in a wireless signal environment | |
EP3512255B1 (en) | User equipment, mobile communication system and cell selection method | |
KR102201832B1 (en) | Coexistence on a shared communication medium | |
CN113556752A (en) | Adaptive beamforming scanning | |
EP3609230A1 (en) | Method for transmitting system information, terminal device and network device | |
CN103843392A (en) | System and method for measurement bandwidth configuration | |
US20130150057A1 (en) | Method of assigning physical layer cell identity of femtocell base station | |
US11601859B2 (en) | Methods and apparatuses for performing new radio cell selection/re-selection | |
RU2663183C1 (en) | Measurements method and device | |
US9692565B2 (en) | Automatic frequency calibration method and small cell using the same | |
EP3360371B1 (en) | Signal quality measurement in different frequency bands of cellular networks | |
EP2846575B1 (en) | Method for Installing a base station in a mobile communication system | |
AU2018223147B2 (en) | Automatic configuration of a digital DAS for signal dominance | |
EP2704475B1 (en) | Method for finding an optimal position of a new pico cell within a macro cell | |
US8787974B2 (en) | Wireless communication base station having dynamic cell structure | |
US20240014867A1 (en) | Hybrid fiber cable distributed antenna system (hfc-das) network with machine learning beam | |
EP3120611B1 (en) | Method performed in a network node for classifying a neighbour cell and a network node | |
KR101732157B1 (en) | Apparatus and method for sniff in home femto-cell | |
TW202344087A (en) | Methods and equipment for measurement configuration |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SERCOMM CORPORATION, TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHU, LING;ZHANG, YUAN;REEL/FRAME:034703/0527 Effective date: 20150114 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |